Mill



H. L. KENT MILL s samstag-smet 1' Filed Aug. 12, 1921 'VTIJIILIIII Jan.l 1924 H.l L. KEN-r MILL Filed Aug. 12. 1921 3 Sheets-Sheet 2 Suva/nto@*emi fa/"adel,

H. l.. KENT MILL s sheets-sheet a Filed Aug. 12. 1921 Patented nlan. 1,1924.

ill TAS hdilelll HORACE L. KENT, OF NEW YORK, N. Y.

MILL.

Application led August 12, 1921. Serial No. 491,687.

To all whom t may concern.'

Be it known that I, HORACE L. KENT, a citizen of the United States ofAmerica, residing at New York city, county of Kings, New York, haveinvented a new and useful Mill, of which the following is aspecification.

My invention relates particularly to mills for crushing stone and othermaterials. The main object is to increase the efficiency and capacity ofthe mill.

The invention is more particularly directed to mills of that type havinga rotating ring and a series of crushing rolls.

The details of the improvement will be understood from the followingspecification and claims. Y

Figure l is a vertical projection and partial section of a millembodying one form of the improvements of my invention;

Fig. 2 is an end view and partial section of the same; l v

Fig. 3 is a fragmentary sectional view;

Fig. et is a vertical sectional view of a modification; and

Fig. 5 is a fragmentary sectional view of a modification.

In the form shown in Figs. 1, 2 and 3 the ring 10 is freely rotatableand has a groove which receives one or more crushing rolls. In the caseherein shown there are four rolls 11, 12, 13 and 14. The shape of therolls and the groove in the ring co-operate to crush the materialbetween them. Each of the rolls is mounted on a shaft eX- tendingtransversely through the ring, such as the shafts 15 and 16. Each shaftis supported ina bearing carried by a member, such as 17, which isadapted to -slide radially in a sleeve 18. Each of the shafts is pressedoutwardly by means of a spring, Such as 19, sothat all of the crushingrollers are yieldingly pressedV into the-groove or track in the ring.'One of the shafts may be driven by suitable means so that its rollerswill frictionally drive the ring, and theA ring in turn will drive theother rollers.

The ring and rollers are enclosed in a suitable housing 20, which isprovided at one or more sides with a hopper or chute 21, through whichthe material to be crushed is fed. The b'ot tom of the chute issubjected to the abrasivev action of the material being ground, and withSome materials the bottom Wears very rapidly. I have provided aremovable bottom section 21', which maybe removed when worn and replacedby a new section. The lower end of the bottom section preferably has adownwardly-extending portion which is substantially flush with theinside of the housing, and the wear will be taken by the bottom and notby the housing. To facilitate the delivery of material to the groove ortrack in the ring 10 between the rollers, I preferably provide aninclined flange 22, which extends up close to the edges of the rollers.I also provide the ring l0 with flanges 23, which extend laterallybeyond the edges of the rollers and inwardly toward the aXis of thering. rlhese iianges 23 serve not only to increase the initial capacityofthe ring, butthey serve to retain the material in the ring for a muchlonger time than is possible with a ring whose width is no greater thanthe width of the roller. Material whichl passes between the rollers andthe ring is crushed or broken and, due to centrifugal force, tends tofly outwardly. The mass being ground will consist of coarse and fineparticles. The larger particles during the rotation will work to thebottom of the ring and be crushed between the ring and rolls, while thefiner particles in the mass will work upwardly or toward the edge of thering and, during the operation of the mill, will be forced along theflanges 23 and over the edge thereof. rlhe flanges 23 serve to retainthe material until `the rproper degree of lineness is attained. In theform shown a substantially annular space is provided at each sidev ofthe ring for the discharge of the crushed material.

lt will be noted in Figs. 1 and 3 that lthe flanges 22 and 23 overlap,that is, the flange 22 extends inside of the flange 23 'of the ring. Itis therefore practically impossible for material `which is being fedinto the mill through the chute 21 to fall through without being actedupon by the crushing rollers.

ln the present instance four rollers are shown in a ring, and each oftwo rollers are mounted diametrically opposite each other. The strainsare thus more nearly equalized than if,`say, three equidistantly spacedrollers were provided. With the form shown,

when a large piece of material gets between the ring and one roller, thespring on the opposite roller is Stressed, while, if three (lll rollerswere provided, the springs on the two rollers' opposite would be'stressed andnparts of the mill might be broken.

Although the apparatus thus far described embodies improvements intheart which may be used by themselves, I have illustrated thoseimprovements in connec-` tion with what may be termed a duplex unit,which has advantagesof its'ow'n.`r` In' the duplex unit construction Iprovide each shaft with two sets of ',rollers, "one set of which co-actswith theriiligld and the other'set of 4which co-acts with the rings l0".i The beartwo sets of rollers and' rings to operate more or 'less'.independently of" each other...v By mounting vtwomro'llers on'elachshaft, the crushing strains are more evenly distributed as eachl rolleris 'somewhat controlledfby the action of the" other froller, and'neitheriroll can search out''ir'idi'vidualv soft spotsinits ring andhammerflat surfacesin' the ring, as sometimes occurs in single unitconstructions. y y' 'y By using four rollers with eaeh'ring, itispossible to locate the' inlet chutewbetween two rollers withan'obtuseangle, thereby reducing the tendency of the fed-in material to flow verth'e sides ofthe ring. VVi't-h 'a steep inlet angle there is less wearon the walls ofthe chute'. l l

In Fig. 4 Ihave illustratedcertain features of the inventionV as appliedtoa modilied form of construction. In vthis case the ring 30 is carriedby a web 3l secured 'to the shaft 32, lwhich is `driven lby`suitable'ineans. Therollers 33 engage'within the vring and are adaptedtobe driven thereby. The housing and ring are'provided `with overlappingIflanges 34k and in a maiiiiersiinilar to that previously described. Theweb" or partition 31""is likewise preferablyV provided l'withflangescorrespondin'g to the"flangesv 34. I have also illustrated. thisVconstruction "ast applied tov a' 'dupleXjQ mill-with a second-ring 30and1 corresponding co-operating:rollers: *In

erves as a partition be- Fig; 5 'sfllustratedfafmpdifed form" of ring*'and rollerf The. ring in" this--.aform '".is provided with side flanges36, the edges of which are turned inwardly toward the transverse plane.ofwthe roller, as a`t`37. The inturned edges serve to retain thematerial in the ring better than a plain flange. In order to provideample rfree space for the passage of material to a point between thering and roller, the latter may be recessed, ifdesired, as at 38.

l. In a crushing mill, a grooved ring, a plurality of rollersmengaging"within said ring,`a housing enclosing said ring and rollers, .saidhaving continuous flanges extending therearound yat"opposiite sides;4and said housing having substantially continuous annular-flanges, :theflanges on 'said housing oyerlapping Vand extending within and beingspaced'from the flanges on saidring whereby material Vfedy intio "thehousing is prevented from falling outside ofthe ring, there being formedya `narrow annular space for `discharge of crushed materiall over ftheouter edgeslof the'ilange'son tliering between the spaced apart annularflanges on the housing 2. Ina crushing'mill, a housing, a plurality ofcrushing rollers, an annular 'ringsurrounding said rollers andcooperating therewith to crush material, said ring'being of greaterywidth thant'saidrollers,and a substantially continuous annular flangeonpsaid housingx projecting inwardly beyond', and overlapping theedgeo'f said 'fring and in close 'proximityf'tfhereto' :whereby materialfed into said ring will be 'prei'fente'dl fromV falling outsidethe'ring; there being 'a' narrow annular space vfor dischargee'of crushedmaterial overltlie edge ofl thev ring between the'annular flange on thehousing and the edge of said ringLf y' 3. In acrushingmill, a housing, aplurality of'roller's, a groved ring surrounding said rollersand'adapted'to cooperate therewithk for grinding material, said ringbeing ofl greater width' than said rollers, and anannular'"fla1ige"carried by said housing at each 'side ofsaid ring andprojecting'l inwardly beyond' the kedges thereof to a point slightly iremoved' therefromY whereby material fed into said ring' will beprevented from'falling outside the ring, there being an annular spacefor jdischarge o f'crushed inateri'al'ove'r theedges of 'thering betweenthe annular flanges uand the edges of thel ring.

4. In 'av crushingmill, a plurality of sets of crushing? rollers, a'corresponding pluralityv yof rings surrounding' said rollers and adaptedtoro-operate therewith for crushing material,*an annular partitionbetween said ring'sfandlflanges projecting from said partition-f frffdeilecting' 'material fed into said rings away t#froirrthe` edgesthereof and betweenthe rings and crushing rollers. f `l`fif'tnafcrishing-mill,'aplnrality of sets 'of crushing rollers, acorresponding plurality of rings surrounding said rollers and adapted to(zo-operate therewith for crushing material, a housing for said ringsand rollers, a partition between said rings, said partition and saidhousing having flanges thereon projecting inwardly toward said rings fordeleeting material fed into the rings to points between the rings andcrushing rollers.

6. In a crushing mill, a plurality of crushing rollers, a ringsurrounding said rollers and co-operating therewith for crushingymaterial, said ring having a continuous flange thereon with its freeedge directed inwardly toward the transverse plane of said rollers, andmeans for rotating said plural# ity1 of rollers and ring relatively toeach ot er.

HORACE L. KENT.

